<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="../../js/jquery-3.4.1.js"></script>
</head>
<body>
<select id="changeSelect">
    <option value="0">对总账</option>
    <option value="1">明细对账</option>
</select>
<span>险种</span>
<select id="insutype">
    <option value="310">职工基本医疗保险</option>
    <option value="320">公务员医疗补助</option>
    <option value="330">大额医疗费用补助</option>
    <option value="340">离休人员医疗保障</option>
    <option value="390">城乡居民基本医疗保险</option>
    <option value="392">城乡居民大病医疗保险</option>
    <option value="510">生育保险</option>
</select>
<span>清算类别:</span>
<select id="clrType">
    <option value="11">门诊</option>
    <option value="21">住院</option>
</select>
<script type="text/javascript">

    $(function () {
        eventInit();
    })

    function eventInit() {
        $("#changeSelect").change(function () {
            $("#insutype").attr("disabled", true);

            let changeSelectVal = $(this).val();
            if (changeSelectVal === "0") {
                $("#insutype").attr("disabled", false);
            }
        });
    }

</script>
</body>
</html>